?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S+K&rft.au=Singh%2C+S+K&rft.aulast=Singh&rft.atitle=Development+and+Promotion+of+Informal+and+Formal+Seed+System+Through+Farmer+Participatory+Seed+Production+of+Pigeonpea+(Cajanuscajan+L.)+in+Uttar+Pradesh%2C+India&rft.title=Agroecology+and+Sustainable+Food+Systems&rft.issn=2168-3573&rft.date=2013&rft.volume=37&rft.pages=531-549&rft.issue=5&rft.genre=article